Pipe-tongs.



D. W. COOPER.

PIPE TONGS.

APPLICATION man AuG.|s.1s1.

Patented July 9, 1.918.

@per

' /n Ven/0r Dan/'e/ 0 DANIEL W. COOPER, 0F LOS ANGELES, CALIFORNIA.

' 'PIPE-Tones.

Specication of Letters Patent.

Patented July 9, 1918.

Application led August 18, 1917. Serial No. 186,941.

To all 'whom it may concern.'

Be it known that I, DANIEL W. COOPER, a citizen of the United States, residing at Los `Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Pipe- Tongs, of which the following is a specification.

This invention relates to pipe tongs or wrenches; and an object thereof is to provide a 'pipe wrench which may be placed around a pipe and effectively grip it substantially entirely around the pipe; to provide a wrench by which great force can be applied to the pipe without crushing or otherwise deforming it; to providea'wrench simplesin construction and operation and generally, to provide a wrench of great efciency of action.

I accomplish these objects by a structure whose typical form is set forth in the following speciiication, wherein 1 describe a preferred'specic formof wrench embodying my invention. For the purpose of this specification I refer to the accompanying.

drawings in which- Fig'ure 1 is plan section of a Wrench embodying my invention; Fig. 2 is a section taken on line 2-2 of Fig. 1; Fig. 3 is a detail section taken on line 3-3 of Fig. 1; Fig. 4 is adetail section taken on line 4-4 of Fig. 2; and Fig. 5 is a reduced plan of the whole length.

In the drawings the numeral 10 designates an inner annular pipe gripping member composed of two halves 11 and 12, which are drawn together and held together by wedges 13 which pass vertically through inter-engaging extensions 11a and 12".L as is best shown in Figs. 2 and 4. The inner surfaces of members 11 and 12 are provided with ratchet teeth 14, preferably by having pieces 15 of hard steel set into their inner surfaces, the pieces 15 carrying the ratchet teeth. The outer surface of this inner an. nular member 10 is also. provided with ratchet teeth 16; and ratchet blocks 17 have lratchetteeth 18 to engage the teeth 16.

Ratchet blocks 17 are carried by the outer operating ring 20 of the device; and springs 21 press the ratchet blocks into proper engagement. This outer operating ring 20 is also made in two halves 23 and 24 secured together by pins 22 which pass vertically throu h inter-engaging extensions .23l and 24 o the halves 23 and l24. The halves 23 and 24 are rotatable'around and upon the inner member 10, Working in the annular circumferential groove 26 inthe inner annular member 10. This Vgroove may have overhanging outside walls 27. A handle 28 extends from one of the halves 23.

When the device is put into use, the inner annular member 10 and outer ring 20 are assembled around the pipe 30 as shown in thedrawings and the wedges 13 are put in place so as to draw the two halves of this inner member together and so as to draw the ratchet teeth 14 into tight engagement with the pipe all around. Oscillation of the outer ring, by means of handle 28, will then cause the rotation of the inner member and of the pipe in the direction indicated by the arrow 1n Fig. 1. 1f it is desired to cause rotation in the opposite direction it is only necessary to turn the wrench over; that is, to turn each part face for face or end for end. To take the wrench olf the pipe itis only necessary to put the parts in the relative position shown in Fig. 4. rEhen remove the wedges and either pin, then swing open on the other pin acting as a hinge. To put the wrench on a pipe, it is only necessary to reverse-the operation. When the wrench is oil" the pipe, each. outer ring vhalf holds its corresponding inner member half; the inner halves are ordinarily never removed from the outer halves except for repairs.

It will be seen thatvva feature of my device is the annular inner member which is immovably placed upon the pipe with its teeth gripping the pipe all around, without any danger of crushing or deforming the pipe, and without the nlecessity of the pipe enga in the teeth c angin their u on theg pipe each time the vrench l(l-i'aliidlis moved back and forth. The outer operatin ring and handle move back and forth an through the medium of the ratchet connection, move the inner member always in the same direction. This ratchet connection may b e of any desired form that will give a one-way movement; I have shown my particular form' of ratchet mechanism as being convenient and eifective.

1 give the above written description as indicative of m invention and not 1n a limitative sense. he device may be modified and as set forth in the following-claims.

Having described a preferred form of my'.'

1. A pipe wrench, embod ing an-innen pipe engaging ring formed o a plurality of separable segments and means to hold the segments together around a pipe, and an outer operating ring carrying the inner ring revoluble therein, said outer ring formed of a similar number of separable segments and means to hold the segm the segments of one ring being held in the segments of the other to be removable therefrom only by endwise movement of one segment in the other.

2. A pipe wrench, embod ing an inner pipe engaging ring formed o a plurality ofseparable segments and means to hold the segments together around a ipe, and an outer operating ring earrylng t e inner ring revoluble therein, said outer ring formed of a similar number of separable segments and means to hold the segmentstogether, one of said rings having an annular groove with overhan 'ng edges in which the other ring is revolu ly held so that the segments of one ring are only removable from the segments of the other by relative endwise movement.

3. A pipe wrench, embed ing an inner pipe engaging ring formed o a plurality of separable segments and -means to hold the segments together around a pipe, and an ents together, and

- outer operating ring carrying theinner ring revoluble therein, said outer ring formed o a similarnumber ofzseparable segments and means to hold the segments together, one jor'-l "for imparting rotation to the inner ring. Y 4; A pipe wrench, embed g 'an 'inner 45 Apipe engaging ring formed o a plurality of separable segments and means to hold the segments together around a pipe, and an outer operatlng ring carrying the inner ring revoluble therein, said outer ring formed of a similar number of separable segments and means to hold the segments together, one of said rings having anannular groove with overhanging edges in which the other ring is revolubly held so that the se ents of one rin are only removable from t e seg` ments of tyie other rby relative endwise movement, said holding means for the inner ring being aeeessible when the outer ring 1s mounted in position. x 6 In Witness that I claim the foregoin I have hereunto subscribed my name this thl D. W. COOPER.

Witness:

JAMES T. BARR-ELE day of August i917. 

